CLASSIFICATION OF INSECTS. 



61 



leading up to the various orders as termini of more or 

 less distinct stocks.^ 



The hne B^ in Diagram 11. indicates the winged 

 stock from which the true Neuroptera sprang, and so 

 far as we know, this may have been the same common 



Diagram III. 



Stock as that from which the Ephemeroptera and 

 Odonata also arose (Diagram I., B). In spite of the 



1 For example, as suggested by Packard in Third Rep. 

 U. 6". Ent. Com., p. 289, the Dermaptera may have been 

 derived from a form similar to Japyx, a curious Thysanuran 



